Add strdup fallback

And move fallback declarations to ass_compat.h
As ass_compat.h is already included in every source file we no longer
need to include _both_ string.h and ass_utils.h to use str(n)dup.
Definitions are still in ass_utils.c since a separate source file just
for two functions seemed overkill.

3 files changed, 24 insertions, 6 deletions

diff --git a/libass/ass_compat.h b/libass/ass_compat.h
index dc3395e..ae16bb7 100644
--- a/libass/ass_compat.h
+++ b/libass/ass_compat.h
@@ -26,4 +26,15 @@
 #define inline __inline
 #endif
 
+#ifndef HAVE_STRDUP
+char *ass_strdup_fallback(const char *s); // definition in ass_utils.c
+#define strdup ass_strdup_fallback
+#endif
+
+#ifndef HAVE_STRNDUP
+#include <stddef.h>
+char *ass_strndup_fallback(const char *s, size_t n); // definition in ass_utils.c
+#define strndup ass_strndup_fallback
+#endif
+
 #endif                          /* LIBASS_COMPAT_H */
diff --git a/libass/ass_utils.c b/libass/ass_utils.c
index 7fba778..65b6f74 100644
--- a/libass/ass_utils.c
+++ b/libass/ass_utils.c
@@ -66,8 +66,20 @@ int has_avx2(void)
 
 #endif // ASM
 
+// Fallbacks
+#ifndef HAVE_STRDUP
+char *ass_strdup_fallback(const char *str)
+{
+    size_t len    = strlen(str) + 1;
+    char *new_str = malloc(len);
+    if (new_str)
+        memcpy(new_str, str, len);
+    return new_str;
+}
+#endif
+
 #ifndef HAVE_STRNDUP
-char *ass_strndup(const char *s, size_t n)
+char *ass_strndup_fallback(const char *s, size_t n)
 {
     char *end = memchr(s, 0, n);
     size_t len = end ? end - s : n;
diff --git a/libass/ass_utils.h b/libass/ass_utils.h
index 0379df6..567f5b5 100644
--- a/libass/ass_utils.h
+++ b/libass/ass_utils.h
@@ -72,11 +72,6 @@ static inline bool ass_string_equal(ASS_StringView str1, ASS_StringView str2)
     return str1.len == str2.len && !memcmp(str1.str, str2.str, str1.len);
 }
 
-#ifndef HAVE_STRNDUP
-char *ass_strndup(const char *s, size_t n);
-#define strndup ass_strndup
-#endif
-
 void *ass_aligned_alloc(size_t alignment, size_t size, bool zero);
 void ass_aligned_free(void *ptr);